This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX85S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI100 Standard Cylinder SI100AX85S
The AirTAC SI100 Standard Cylinder SI100AX85S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 85mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX85S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX85S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI100 Standard Cylinder SI100AX85S
The AirTAC SI100AX85S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 3927 N push force at 0.5 MPa. It features an SUS420J2 stainless piston rod, a G1/2 air port, and a built-in magnet for legacy CS1-B/DS1-B switches. AirTAC replaced this legacy unit with the SAI100AX85S.
The SAI100AX85S is a direct replacement retaining the exact ISO 15552 mounting interface, 85 mm stroke, and force class. It upgrades longevity via two Y-shaped one-way piston seals for low start-up pressure. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI100 Standard Cylinder SI100AX85S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX85S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX85S |
| Bore size | Ø100 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100AX85S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100AX85S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100AX85S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI100 Standard Cylinder SI100AX85S Is Used
Heavy Press Clamping
Generates 3927 N of push force at 0.5 MPa to secure heavy metal workpieces during machining or welding operations.
Corrosive Fluid Diversion
The SUS420J2 stainless rod actuates diverter gates in washdown or chemical environments without pitting.
Replacing the Airtac SI100 Standard Cylinder SI100AX85S with the SAI100AX85S
To replace the SI100AX85S, order the SAI100AX85S direct: verify the ISO 15552 mounting interface, 100 mm bore, 85 mm stroke, G1/2 port (PT/G/NPT), and the -S magnet for current AirTAC switches. Size both ways: if force is insufficient, the 125 mm bore yields 6136 N push at 0.5 MPa; if downsizing, the 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SUS420J2 rod suits corrosive environments; a Viton H seal extends heat to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX85S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100AX85S FAQ
Yes, the SI100AX85S is discontinued. The direct replacement is the SAI100AX85S. It shares the same ISO 15552 mounting interface, 100 mm bore, 85 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/2 air port. It delivers 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical maximum of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX85S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX85S replacement — usually within 7-8 hours.